Electric fan capable of stably discharging air

Abstract

The utility model relates to the field of electric fans, and discloses an electric fan capable of discharging air stably, which comprises a motor component and a fan component driven by an output shaft of the motor component, and one end of the output shaft is inserted into the fan component and matched with a movable impeller of the fan component through a first bearing in a rotating and supporting mode. The end, away from the fan assembly, of the output shaft penetrates through a support arranged at the end, away from the fan assembly, of the motor assembly and is rotationally supported and matched through a second bearing, the second bearing is in a drum shape, and a drum-shaped groove capable of containing the second bearing and allowing the second bearing to deflect within a preset angle is formed in the center of the support. According to the electric fan, the problem that the concentricity of the first bearing and the second bearing is inconsistent due to installation errors can be automatically corrected through the matching structure of the second bearing and the support, then the rotating smoothness of the output shaft is improved, and stable air outlet is achieved.

Description

Technical Field

[0001] This utility model relates to the field of electric fan technology, and in particular to an electric fan with stable air output. Background Art

[0002] An electric fan is a combination of a motor and a fan. It can take in air at one end and take out air at the other end. It is widely used in the fields of air pumps and spraying machines. The structure of the electric fan can be referred to the electric fan and terminal equipment disclosed in the Chinese patent application with application number 202211465813.9, which includes a motor assembly, an impeller assembly and a guide shroud. The motor assembly includes an output shaft, a bracket and a stator-rotor assembly. The bracket and the stator-rotor assembly are sleeved on the output shaft. The impeller assembly is located on one side of the stator-rotor assembly and is sleeved on the output shaft.

[0003] The rotation of the impeller assembly is controlled by the stable rotation of the output shaft. The output shaft and the impeller assembly, as well as the output shaft and the bracket, all require rotational support through bearings. The bearings of the output shaft and the impeller assembly are located inside the electric fan and need to bear most of the load. They are not easy to adjust after installation. Therefore, even a slight installation error in the bearing will affect the bearing installation accuracy between the bracket and the output shaft. Thus, ensuring the concentricity of the output shaft during bearing assembly requires very high assembly accuracy, resulting in high assembly difficulty.

[0004] In conclusion, it is essential to provide an electric motor that can automatically correct bearing installation misalignment to ensure that the two bearings are concentric, thereby enabling the output shaft to operate smoothly. Utility Model Content

[0005] This invention addresses the shortcoming of existing electric fans where installation errors in the two bearings can lead to unstable output shaft operation. It provides an electric fan that can improve the smoothness of output shaft operation to achieve stable airflow.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0007] An electric fan with stable air output includes a motor assembly and a fan assembly driven by the output shaft of the motor assembly. One end of the output shaft is inserted into the fan assembly and is rotatably supported by a first bearing and a moving impeller of the fan assembly. The end of the output shaft away from the fan assembly passes through a bracket provided at the end of the motor assembly away from the fan assembly and is rotatably supported by a second bearing. The second bearing is in the shape of a drum, and the center of the bracket has a drum-shaped groove that can accommodate the second bearing and allow the second bearing to deflect within a preset angle.

[0008] Using the above scheme, the outer ring of the second bearing is made into a drum shape, and a drum-shaped groove is provided on the bracket. The second bearing can slightly deflect relative to the drum-shaped groove of the bracket within a preset allowable angle to correct the angular deviation caused by the installation of the second bearing and / or the first bearing, so that the two bearings can remain concentric, and the output shaft can run smoothly to ensure that the motor can output air stably.

[0009] Preferably, the drum-shaped groove is open at the top and bottom, with the lower opening being larger than the maximum diameter of the second bearing and the upper opening being smaller than the maximum diameter of the second bearing. A limiting shim is fixed at the lower end of the bracket to prevent the second bearing from coming out.

[0010] Using the above scheme, after the second bearing is assembled into the drum-shaped groove from the lower opening, the axial positioning is completed by the limiting shim. The limiting shim is located at the lower end and can be concealed, which increases the aesthetics of the motor.

[0011] Preferably, there is a micro-movement gap of 0.05 mm to 0.1 mm between the drum-shaped groove and the outer ring wall of the second bearing.

[0012] By adopting the above solution, the aforementioned micro-movement clearance can satisfy the second bearing to deflect within a small range to ensure that the second bearing and the first bearing remain concentric, so that the output shaft can rotate stably.

[0013] Preferably, the first bearing is a deep groove ball bearing, with the output shaft and the inner ring of the deep groove ball bearing having an interference fit, and the second bearing is a metallurgical powder oil-impregnated bearing, with the output shaft and the metallurgical powder oil-impregnated bearing having a clearance fit.

[0014] Using the above scheme, since the first bearing needs to bear a large load, a deep groove ball bearing is used. Deep groove ball bearings have the advantages of good radial load and long service life. The second bearing does not have high load-bearing performance requirements, so a metallurgical powder oil-impregnated bearing is used. This bearing has a clearance fit with the output shaft, which is different from the interference fit required for deep groove ball bearings. This can reduce the fit resistance, which can not only reduce the total load on the output shaft, but also reduce the cost.

[0015] Preferably, an oil storage chamber is provided inside the end of the output shaft near the bracket, and an oil outlet hole communicating with the oil storage chamber is provided on the side wall of the output shaft at the center hole facing the metallurgical powder oil-impregnated bearing. A sealing member capable of sealing or opening the oil outlet hole is provided inside the oil storage chamber, and a drive button is provided at the end of the output shaft. The sealing member opens the oil outlet hole when the drive button is pressed and closes the oil outlet hole when the drive button is reset.

[0016] The above solution addresses the issue that the metallurgical powder oil-impregnated bearing will fail once its internal lubricating oil is depleted, leading to the scrapping of the electric fan. Since existing metallurgical powder oil-impregnated bearings cannot be refilled with lubricating oil, an oil reservoir is installed on the output shaft to extend its service life. Because the output shaft rotates at high speed during operation, to prevent lubricating oil waste, the oil outlet hole needs to be sealed under normal conditions to ensure lubricating oil is stored in the reservoir. Before use or at regular intervals, pressing the drive button allows lubricating oil to enter the clearance between the metallurgical powder oil-impregnated bearing and the output shaft through the oil outlet hole, thus lubricating the clearance and extending the service life of the metallurgical powder oil-impregnated bearing.

[0017] Preferably, a mating ring extends downward from the top surface of the oil storage cavity, and the sealing element is a sealing ring that seals the movement between the mating ring and the inner wall of the oil storage cavity. A first spring is sleeved at the top of the oil storage cavity between the oil storage cavity and the mating ring to drive the sealing ring to seal the oil outlet.

[0018] Using the above scheme, the sealing ring rises when the oil pressure increases, exposing the oil outlet, and falls back to seal the oil outlet again under the reset action of the first spring when the oil pressure decreases.

[0019] Preferably, the oil reservoir is recessed at one end of the output shaft near the bracket, and a threaded cover is screwed to this end for sealing. A mating ring protrudes from the lower end of the threaded cover, and a through groove with a diameter smaller than that of the mating ring is provided on the threaded cover. The drive button is a piston that moves in a sealed manner within the mating ring. An overlapping protrusion is provided on the inner wall of the mating ring, and a second spring is provided between the overlapping protrusion and the piston to drive the piston to abut against the inner wall of the top of the threaded cover.

[0020] The above solution, with its threaded cap design, allows for repeated addition of lubricating oil and facilitates the installation of drive buttons and seals.

[0021] Preferably, the cross-section of the through groove is a regular hexagon.

[0022] Using the above solution, the shape of the through groove facilitates the insertion of a regular hexagonal screwdriver, which can be used to install and remove the threaded cover and press the drive button.

[0023] Preferably, the oil outlet is located in the middle of the axial direction of the metallurgical powder oil-impregnated bearing and is distributed circumferentially around the output shaft in several places.

[0024] By adopting the above scheme, the oil outlet hole is set as described above, which facilitates the even distribution of lubricating oil in the fit gap between the metallurgical powder oil-impregnated bearing and the output shaft, and can shorten the thickness of the sealing ring.

[0025] Preferably, the support is made of iron.

[0026] Using the above solution, the support frame is made of iron, which can reduce the cost.

[0027] This utility model, by adopting the above technical solution, has significant technical effects:

[0028] 1. The first bearing between the output shaft and the impeller is a deep groove ball bearing. The second bearing between the output shaft and the support is a metallurgical powder oil-impregnated bearing instead of a deep groove ball bearing. The metallurgical powder oil-impregnated bearing is made into a round drum shape. After it is matched with the drum-shaped groove of the support, it can slightly deflect within a preset angle to ensure that the bearing can be concentric with the first bearing, making the rotation of the output shaft smoother. The above bearing combination can further reduce the total load on the output shaft and has the advantages of improved smoothness of operation, reduced energy consumption and reduced cost.

[0029] 2. An oil reservoir, an oil outlet, a sealing ring, and a drive button are added to the output shaft. The oil outlet is normally closed to avoid wasting lubricating oil in the reservoir. Only when the drive button is pressed down can the sealing ring move to expose the oil outlet, and the lubricating oil enters the gap between the metallurgical powder oil-impregnated bearing and the output shaft for lubrication, thus extending the service life of the metallurgical powder oil-impregnated bearing. Attached Figure Description

[0030] Figure 1 This is an isometric view of an air outlet stabilizing electric fan according to Example 1;

[0031] Figure 2 This is a top view of an electric fan with stable air output according to Embodiment 1;

[0032] Figure 3 yes Figure 2 A sectional view of AA;

[0033] Figure 4 This is a top view of an electric fan with stable air output according to Embodiment 2;

[0034] Figure 5 yes Figure 4 A cross-sectional view of BB;

[0035] Figure 6 yes Figure 5 An enlarged view of A.

[0036] The parts referred to by the numbers in the above attached figures are as follows: 1. Housing; 2. Bracket; 201. Drum groove; 3. Brush assembly; 301. Brush housing; 302. Graphite brush; 303. Abutment spring; 4. Output shaft; 401. Oil outlet; 402. Oil reservoir; 403. Drive button; 404. Mating ring; 405. Overlapping convex ring; 406. Sealing ring; 407. First spring; 408. Second spring; 409. Threaded cap; 4091. Through groove; 5. Air collector hood; 6. Cover; 7. Moving impeller; 8. Deep groove ball bearing; 9. Metallurgical powder oil-impregnated bearing; 10. Stable impeller; 11. Rotor; 12. Limiting gasket. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] A type of electric fan with stable air output, referring to Figures 1-3 As shown, the device includes a motor assembly and a fan assembly. The motor assembly includes a housing 1, a stator and a rotor 11 located inside the housing 1, and a support 2 located at the upper end of the housing 1. The fan assembly includes a cover 6 fixed to the lower end of the housing 1, a fixed impeller 10 fixed inside the cover 6, and a rotating impeller 7. The lower end of the cover 6 is an air inlet, and the upper end of the cover 6 is an air outlet. A funnel-shaped air collector 5, which is smaller at the top and larger at the bottom, is provided at the upper end of the cover 6. The air collector 5 can concentrate the airflow. Brush assemblies 3 are symmetrically fixed on both sides of the frame 2. The brush assemblies 3 are connected to the rotor 11. The rotor 11 passes through the stator. The rotor 11 includes a rotor core, an output shaft 4, an armature winding, and a commutator. The stator includes a core and a stator winding. The lower end of the output shaft 4 is inserted into the housing 6 and rotates with the moving impeller 7 through a deep groove ball bearing 8. The outer ring of the deep groove ball bearing 8 is interference-fitted with the moving impeller 7, and the inner ring of the deep groove ball bearing 8 is interference-fitted with the output shaft 4. The above structure is the prior art.

[0040] The bracket 2 is made of iron, and the brush assembly 3 includes a brush housing 301 made of BMC, a graphite brush 302 located inside the housing, and a pressure spring 303 that drives the graphite brush 302 to abut against the rotor 11.

[0041] The upper end of the output shaft 4 passes through the bracket 2 and slides through the metallurgical powder oil-impregnated bearing 9. The metallurgical powder oil-impregnated bearing 9 has a central hole through which the output shaft 4 passes with clearance fit. The metallurgical powder oil-impregnated bearing 9 is generally drum-shaped. The center of the bracket 2 is raised vertically and vertically, and a drum-shaped groove 201 is formed inside to accommodate the metallurgical powder oil-impregnated bearing 9 and allow it to deflect within a preset angle. There is a micro-movement gap of 0.1mm between the drum-shaped groove 201 and the metallurgical powder oil-impregnated bearing 9. This micro-movement gap allows the metallurgical powder oil-impregnated bearing 9 to move slightly within the drum-shaped groove 201 to maintain concentricity with the deep groove ball bearing 8. The drum-shaped groove 201 is open at the top and bottom. The lower opening of the drum-shaped groove 201 is larger than the maximum diameter of the metallurgical powder oil-impregnated bearing 9, and the upper opening of the drum-shaped groove 201 is smaller than the maximum diameter of the metallurgical powder oil-impregnated bearing 9. A limiting shim 12 for limiting the metallurgical powder oil-impregnated bearing 9 is welded at the lower end of the bracket 2.

[0042] The clearance fit between the metallurgical powder impregnated bearing 9 and the output shaft 4 reduces the resistance to the output shaft 4, thereby reducing the total load on the output shaft 4 and achieving the advantage of reduced energy consumption. The drum-shaped fit between the metallurgical powder impregnated bearing 9 and the bracket 2 and the drum-shaped groove 201 can also correct the installation error of the deep groove ball bearing 8 and / or the metallurgical powder impregnated bearing 9, keeping them concentric and increasing the smoothness of the rotation of the output shaft 4. The cost of the metallurgical powder impregnated bearing 9 is half that of the deep groove ball bearing 8. Since the impeller 7 and the output shaft 4 use the deep groove ball bearing 8, most of the load is borne by the deep groove ball bearing 8, and the load at the bracket 2 is smaller, so the metallurgical powder impregnated bearing 9 is sufficient. Therefore, the electric fan operates smoothly and stably, and the cost and energy consumption are reduced.

[0043] Example 2

[0044] This embodiment is based on embodiment 1, with reference to... Figures 4-6 As shown, a lubrication structure is added, which includes an oil storage cavity 402 recessed at one end of the output shaft 4 near the bracket 2. A threaded cap 409 is screwed onto the oil storage cavity 402. An oil outlet hole 401 is provided in the middle of the axial direction of the metallurgical powder oil-impregnated bearing 9 on the side wall of the oil storage cavity 402. Several oil outlet holes 401 are evenly spaced around the circumference of the output shaft 4. The opening or closing of the oil outlet holes 401 is controlled by a sealing element.

[0045] A mating ring 404 extends downward from the lower end of the threaded cap 409. The sealing element is a sealing ring 406 that seals the movement between the inner wall of the oil storage cavity 402 and the outer wall of the mating ring 404. A first spring 407 is sleeved between the inner wall of the oil storage cavity 402 and the outer wall of the mating ring, with both ends fixed to 409 and the sealing ring 406 respectively, and driving the sealing ring 406 to block the oil outlet 401.

[0046] An overlapping protrusion ring 405 is provided on the inner wall of the lower end of the mating ring 404. A regular hexagonal through groove 4091 is provided on the threaded cover 409. The rise of the sealing ring 406 is controlled by the increase of oil pressure in the oil storage chamber 402. The increase or decrease of oil pressure in the oil storage chamber 402 is controlled by a drive button. The drive button includes a piston 403 that moves within the mating ring 404. A second spring 408 is provided between the piston 403 and the overlapping protrusion ring 405, with both ends abutting against both. The piston 403 is driven by the second spring 408 to rise to abut against the inner surface of the upper end of the threaded cover 409, and the upper end of the piston 403 can seal the through groove 4091.

[0047] Under normal conditions (without external force driving the piston 403), the oil outlet 401 is closed. The output shaft 4 and the metallurgical powder oil-impregnated bearing 9 are lubricated by the lubricating oil of the metallurgical powder oil-impregnated bearing 9 itself. After a period of use or according to actual needs, the piston 403 can be driven down by pressing with tools such as a hexagonal screwdriver. After the oil pressure in the oil storage chamber 402 increases, the sealing ring 406 rises against the elastic force of the first spring 407, exposing the oil outlet 401. The pressurized lubricating oil enters from the oil outlet 401 to the mating gap between the output shaft 4 and the metallurgical powder oil-impregnated bearing 9 for lubrication. After the screwdriver is pulled out, the piston 403 rises under the action of the second spring 408 until the sealing ring 406 falls under the first spring 407 to seal the oil outlet 401. With the rotation of the screwdriver, the threaded cap 409 can also be unscrewed for repeated addition of lubricating oil. The above structure can significantly extend the service life of the metallurgical powder oil-impregnated bearing 9, thereby extending the service life of the electric fan.

[0048] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A stable airflow electric fan, comprising a motor assembly and a fan assembly driven by an output shaft (4) of the motor assembly, one end of the output shaft (4) being inserted into the fan assembly and rotatably supported by a first bearing and a moving impeller (7) of the fan assembly, the other end of the output shaft (4) being away from the fan assembly passing through a bracket (2) provided at the other end of the motor assembly and rotatably supported by a second bearing, characterized in that: The second bearing is in the shape of a drum, and the bracket (2) has a drum-shaped groove (201) at the center that can accommodate the second bearing and allow the second bearing to deflect within a preset angle.

2. The electric fan with stable air output according to claim 1, characterized in that: The drum-shaped groove (201) has openings at the top and bottom. The lower opening is larger than the maximum diameter of the second bearing, and the upper opening is smaller than the maximum diameter of the second bearing. A limiting shim (12) is fixed at the lower end of the bracket (2) to restrict the second bearing from coming out.

3. The electric fan with stable air output according to claim 2, characterized in that: There is a micro-movement gap of 0.05mm to 0.1mm between the drum-shaped groove (201) and the outer ring wall of the second bearing.

4. The electric fan with stable air output according to claim 1, characterized in that: The first bearing is a deep groove ball bearing (8), and the output shaft (4) is interference-fitted with the inner ring of the deep groove ball bearing (8). The second bearing is a metallurgical powder oil-impregnated bearing (9), and the output shaft (4) is clearance-fitted with the metallurgical powder oil-impregnated bearing (9).

5. The electric fan with stable air output according to claim 4, characterized in that: An oil storage chamber (402) is provided inside the end of the output shaft (4) near the bracket (2). An oil outlet hole (401) communicating with the oil storage chamber (402) is provided on the side wall of the output shaft (4) at the center hole facing the metallurgical powder oil-impregnated bearing (9). A sealing member capable of sealing or opening the oil outlet hole (401) is provided inside the oil storage chamber (402). A drive button is provided at the end of the output shaft (4). The sealing member opens the oil outlet hole (401) when the drive button is pressed and closes the oil outlet hole (401) when the drive button is reset.

6. The electric fan with stable air output according to claim 5, characterized in that: A mating ring (404) extends downward from the top surface of the oil storage cavity (402). The sealing element is a sealing ring (406) that seals the movement between the mating ring (404) and the inner wall of the oil storage cavity (402). A first spring (407) is sleeved at the top of the oil storage cavity (402) between the oil storage cavity (402) and the mating ring (404) to drive the sealing ring (406) to seal the oil outlet (401).

7. The electric fan with stable air output according to claim 6, characterized in that: An oil reservoir (402) is recessed at one end of the output shaft (4) near the bracket (2). A threaded cap (409) is screwed to this end. A mating ring (404) protrudes from the lower end of the threaded cap (409). A through groove (4091) with a diameter smaller than that of the mating ring (404) is provided on the threaded cap (409). The drive button is a piston (403) that moves in the mating ring (404). An overlapping protrusion (405) is provided on the inner wall of the mating ring (404). A second spring (408) is provided between the overlapping protrusion (405) and the piston (403) to drive the piston (403) to abut against the inner wall of the top of the threaded cap (409).

8. The electric fan with stable air output according to claim 5, characterized in that: The cross-section of the through groove (4091) is a regular hexagon.

9. The electric fan with stable air output according to claim 5, characterized in that: The oil outlet (401) is located in the middle of the axial direction of the metallurgical powder oil-impregnated bearing (9) and is distributed in several circumferentially around the output shaft (4).

10. The electric fan with stable air output according to claim 1, characterized in that: The support (2) is made of iron.

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